Working with large PST files

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Performance may be degraded when processing large PST files. The following suggestions will help improve the performance of your app when processing large files.

using var pst = PersonalStorage.FromFile(@"storage.pst");

foreach (var folder in pst.RootFolder.EnumerateFolders())
foreach (var messageInfo in folder.EnumerateMessages())
{
    // Do something with message
}
foreach (var messageInfo in folder.EnumerateMessages())
{
    Console.WriteLine($"Subject: {messageInfo.Subject}");
    Console.WriteLine($"To: {messageInfo.DisplayTo}");
    Console.WriteLine($"Importance: {messageInfo.Importance}");
    Console.WriteLine($"Message Class: {messageInfo.MessageClass}");
}
foreach (var id in folder.EnumerateMessagesEntryId())
{
  // Use id to retrieve a property (ExtractProperty),
    // extract a MapiMessage (ExtractMessage),
    // extarct message attachments (ExtractAttachments),
    // save msg to a stream(SaveMessageToStream).
}
foreach (var msgId in folder.EnumerateMessagesEntryId())
{
   var transportMessageHeaders =
       pst.ExtractProperty(Convert.FromBase64String(msgId), KnownPropertyList.TransportMessageHeaders.Tag)
           .GetString();
}
foreach (var msgId in folder.EnumerateMessagesEntryId())
{
   var attachments = pst.ExtractAttachments(msgId);
}
using var pst = PersonalStorage.FromFile(@"storage.pst");

var builder = new PersonalStorageQueryBuilder();
// Unread messages
builder.HasNoFlags(MapiMessageFlags.MSGFLAG_READ);

foreach (var folder in pst.RootFolder.EnumerateFolders())
{
    var unread = folder.GetContents(builder.GetQuery());
}

Instead of using:

foreach (var id in folder.EnumerateMessagesEntryId())
{
    var msg = pst.ExtractMessage(id);
    msg.Save(@"message.msg");
}

Use:

foreach (var id in folder.EnumerateMessagesEntryId())
{
    pst.SaveMessageToStream(id, File.OpenWrite(@"message.msg"));
}